Coaster-brake.



H. S. WALKER.

GOASTBR BRAKE.

APPLIUATION FILED MAR.11,1913.

1,089,997. Patented Mar. 10, 1914.

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COASTBR BRAKE.

APPLICATION FILED 112.11.11, 1913.

1,089,997. Patented Mar.10,1914.

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HENRY S. WALKER, OF WALES, MASSACHUSETTS.

COASTER-BMKE.

Specication of Letters Patent.

Patented Mar. 10, 191.4.

Application led March 11, 1913. Serial No. 753,557.

To all whom it may concern Be it known that I, HENRY S. WALKER, acitizen of the United States, residing at iVales, in the county ofHampden and State of Massachuscttsp have invented new and usefulImprovements in Coaster-Brakes, of which thc following is aspecification.

This invention relates to coaster brakes, the object of the inventionbeing to prov1de a brake of the class referred to, embodying anextremely simple construction and relative arrangement of parts, andalso obtaining a double braking action, or in other words thesilnultaneous operation of two sets of brake shoes, one of which coactswith the hub shell of the wheel, in connection with which the device isused, the other set operating against a drum which revolves with the huband is arranged at one end thereof.

Another object of the invention is to provide, in combination with twosets of brake shoes and means for operating one set of brake shoes, acoupling member which is located in such relation to the two sets ofshoes that the braking action of 011e set of shoes is transmitted,through the medium of the coupling member, to the other set of brakeshoes, causing the latter to be thrown into action.

With the above and other objects in view, the invention consists in theconstruction, combination and arrangement of partsas will be hereinaftermore fully described, illustrated in the accompanying drawings, andpointed out .in the claims hereunto appended.

In the drawings: Figure 1 is a longitudinal section taken through thehub of a wheel, showing the remaining parts of the coaster brakemechanism of this invention in elevation. Fig. 2 is a similar sectiontaken through all of the parts, with the exception of the axle, which isshown in elevation. Fig. 3 is a cross section on the line 3-3 of Fig. 1.Fig. 4 is a cross section on the line 4-4 of Fig. 1. Fig. 5 is an endelevation of the same, looking toward the drum end of the hub. Fig. G isa detail perspective View of one of the hub engaging shoes. Fig. 7 is asimilar view of one of the drum engaging shoes. Fig. 8 is a detailperspective view of t-he coupling member.

Referring to the drawings, 1 designates the body or shell of a wheelhub, such as ordinarily used in bicycles, motorcycles, and

the like, said hub being provided at suitable distances apart with spokeengaging flanges 2, which are shown as provided with keyhole slots 3, inwhich the enlarged and laterally bent headed ends of the spokes aresecured in a manner well understood by those familiar with the art towhich this invention appertains.

4 designates the wheel axle which passes centrally and longitudinallythrough. the hub 1, and is ordinarily secured in fixed relation to themachine frame.

ln carrying out the present invention, provide the hub l at one endthereof with a relatively large drum 5, within which are arranged theinternal expanding brake shoes, hereinafter particularly referred to.

Adjacent to its opposite end, the hub is provlded with an internalfiange (S which is toothed or serrated, as shown at 7, for a purposewhich will hereinafter appear.

Mounted to turn on the axle 4 is a rotary driving and brake actuatingmember which ordinarily carries the sprocket wheel 8', from which theusual sprocket chain extends to another sprocket wheel on the pedalshaft. The member 8 is mounted to turn freely on the axle 4 by means ofball bearings, 9 designating one of the ball cones at that end of thehub.

The driving member 8 which is adapted to be turned either in a forwardor backward direction, or held stationary by means of the usual pedals,is provided with an inward extension 10 which is threaded, as shown at11, to receive a tapered expander which is threaded on the extension 11and provided with a tapered expanding face 12, and a toothed or serratedface 13, the lastnamed face being adapted to be moved into and out ofengagement with the toothed flags 7 of the stationary flange 6 withinthe Surrounding the expander 12 is a set of brake shoes 14, said brakeshoes together, forming a longitudinally divide cylinder, t-he sectionsof which are movable independently of each other into and out ofengagement with the inner surface of the hub or shell l. Interiorly, theshoes 14 are tapered to agree with the taper of the expander, so thatwhen the latter is moved toward the center of the hub by the action ofthe threaded extension 11, said expander serves to force the brake shoesoutwardly into braking engagement with the hub.

Internal expanding brake shoes 15 are arranged within the enlar ed drum5 at the end of the hub, and are esi'gned to work in conjunction withand in addition to the brake shoes '14, hereinabove described. rIheshoes 15 are provided with slots 16, all of which are shown as extendingin parallel planes and being designed to receive holding pins 17 and 18rojecting inwardly from and bearing a xed relation to an anchoringmember or plate 19. This plate 19 is provided with a central opening 20to receive the axle 4:, and in order to hold said anchoring memberstationary, it is provided with an arm 21 having a hole 22 therein, by,

means of which it is'adapted to be bolted or otherwise fastened to themachine frame withthe aid of a clip 23, or the equivalent thereof, asshown in Fig. 6.l The brake shoes 15 are divided from each other on adiametrical line, as illustrated, and the slots 1G admit of the'sections moving toward andv ,away from each other on the pins 17, whichpins, however, hold the shoes from revolving, so that when they arethrown outwardly into contact with the inner surface of the drum 5, theyproduce a braking effect thereon.

The shoes 15 are normally pressed in-y wardly by means of coiled springs24 arranged in recesses 25 `in the brake shoe sections, said 'springs 2Abearing at their outer ends against the inner sides of the diametri.-cally opposite pins 18, theY inner faces of which are flattened, at 26,toform more effective seats for the springs. The two `sets of brakeshoes 14: and 15 are connected for simultaneous operation by means of akeyy member 27, said key member being peripherally grooved to form aball race 28, in which is arranged a series of balls 29 which work inball races 30 within the adjacent end of the hub 1, forming a ballbearing support for said hub at that end. Another series of balls 31 isarranged at the opposite end of the hub between the driving wheel 8 andthe hub. The member 27 is provided at opposite sides with keys 32 and33, the key 32 fitting into notches 34 in the meeting fac's of the brakeshoes 14, while the key 33 fits into other notches 35 in the meetingfaces of the brake shoes 15. l.

The operation of the mechanism hereinabove described is as follows: Instarting the motorcycle or other machine, the driving member- 8 isrotated in a forward direction, which causes the expander 12 to movetoward the right. This brings the teeth 13 thereof into drivingengagement with the teeth 7 within the hub 1, thereby propelling thewheel in a forward direction. As soon as the engine takes up itsoperation and drives the hub 1 through the usual connections (notshown), the operator holds back on the pedals and thereby causes theexnotate? pander to move out of driving engagement with the hub. Toapply the brake, theoper ator back pedals, until the expander forces thebrake shoes .14 into frictlonal enga ement with the inside of the hub 1.In t is operation, a slighty turning movement is'imf parted to themember 27 by means of the key 32 thereon. `The other key 33 carried bythe member 27 then operates to force the brake shoes 15 in oppositedirections and into braking engagement with the interior face of thedrum 5. Thus the member 27 transfers motion from one set of brake shoesto the other, so that when thehub engaging brake shoes .are thrown intoaction, the internal expanding drum en aging shoes are also thrown intoaction, t rough the medium of the interposed key member. `What isclaimed is:

1. In a coaster brake, a wheel hub, an axle, a driving and brakeactuating member 'our naled on the axle at one end of the hu an inwardlyprojecting threaded extension on said member, expandin brake shoesacting against the inside of the hub, .a tapered expander threaded onsaid extension and serving to wedge said shoes apart, a drum on the endof the hub, internal expanding brake shoes engaging said drum, meanstosupport the drum engagingr shoes against rotation, and a key interposedbetween and engaging the two sets of brake shoes whereby the hubengaging shoes effect an expanding movement of t e drum engaging shoesthrough the medium of said key.

2. In a coaster brake, a wheel hub, an axle, a driving and brakeactuating member journaled on the axle at one end of the hub, aninwardly projecting threaded extension on said brake actuating member,expanding brake shoes acting against the inside of the hub, a taperedexpander threaded on said extension and serving to wedge said shoeslapart a drum on the end of the hub, intei-nai expanding brake shoesengaging said drum, means vto support the drum engaging shoes againstrotation, a key interposed between and engaging the two sets of brakeshoes whereby the hub engaging shoes effect an expanding movement of thedrum engaging shoes through the ymedium of said key, and meansserving-to yieldingly sustain the drum brake shoes away from the drum.

3. Inf a coaster brake, a' wheel hub, an axle, a driving and brakeactuating member 'ournaled on the axle at one end of the hu an inwardlyprojecting threaded extension on said brake actuating member, expandingbrake shoes acting against the inside of the hub, a taperedexpanderthreaded on said extensin and serving to wedge said shoes aparta drum on the endvof the hub, internai expanding brake shoesengaging-said drum, means to supportthe drum engaging shoes againstrotation and a key'interposed between and engaging the two sets of brakeshoes whereby the hub engaging shoes effect an expanding movement of thedrum engaging shoes through the medium of said coupling member, saidcoupling member forming a ball race of a ball bearing on which said hubturns.

4. In a coaster brake, a wheel hub, an axle, a driving and brakeactuating member 'ournaled on the axle at one end of the hu an inwardlyprojecting threaded extension on said brake actuating member, expandingb 'ake shoes acting againstthe inside of the hub, a tapered expanderthreaded on said extension and serving to wedge said shoes apart, a drumon the end of the hub, internal expanding brake shoes engaging saiddrum, means to support the drum engaging shoes against rotation, acoupling member interposed between the two sets of brake shoes,

and keys on said coupling member, the brake shoes at opposite sides ofsaid coupling member being engaged by said keys in such manner thatthroufh the medium of the coupling member die braking action of one setof brake shoes causes the braking action of the other set.

5. In a coaster brake, a wheel hub an axle, a. driving and brakeactuating member journaled on the axle at one end of the hub, aninwardly projecting threaded extension on said brake actuating member,expanding brake shoes acting against the inside of the hub, a taperedexpander threaded on said extension and serving to wedge said shoesapart, a drum on the end of the hub, internal expanding brake shoesengaging said drum, an anchoring member by which the drum engaging shoesare supported and held, and a key interposed between and enffaging thetwo sets of brake shoes whereby the hub engaging shoesefect an expandinmovement of the drum engaging shoes t rough the medium of said key.

6. In a coasier brake, a wheel hub, an axle, a driving and brakeactuating member journaled on the axle at one end 0f the hub, aninwardly projecting threaded extension on said brake actuating member,expanding brake shoes acting against the inside of the hub, a taperedexpander threaded 0n said extension and serving to wedge said slicesapart, a drum on the end of the hub, internal expanding brake shoesengaging said drum and formed with slots, an anchoring meinber, pins onthe latter lying in said slots, and a key interposed between and engaginr the two sets of brake shoes whereby the hu engaging shoes effect anexpanding movement of the drum engaging shoes through the medium of saidkey.

In testimony whereof I aix my signature in presence of two Witnesses.

HENRY S. WALKER.

Witnesses:

Ozno P. ROYCE, JAMES H. WALKER.

